Mind and body are linked. One effects the other. Taking care of our basic needs like nutrition, sleep and hydration is essential to prevent disorders like depression and anxiety.
Mental health practices are practices that are done to maintain and improve a healthy mind. We go into large extend for the maintenance and improvement of physical health. To some extend we try to take care of our emotions but that too is usually to alleviate the physical discomfort and some extend the mental discomfort sometimes emotions can create.